Arrangement for treating metal parts



Dec. 2, 1952 U R 2,619,781

ARRANGEMENT FOR TREATING METAL PARTS Filed Oct. 3. 1950 INVENTOK: N n EL brew @ilwu w ATTORNEHS Patented Dec. 2, 1952 ARRANGEMENT FOR TREATING METAL PARTS Erwin Biihrer, Schaffhausen, Switzerland, as-

signor to Georg Fischer Aktiengesellschaft, Schafihausen, Switzerland, a company of Switzerland Application October 3, 1950, Serial No. 188,139 In Switzerland October 12, 1949 1 Claim.

The present invention relates to an arrangement for the treatment of metal parts in drums or barrels which, during their movement through the space in which the goods being treated are subjected to the action of a liquid substance,

are rotated about a horizontal axis. Arrangements of this type are employed more particularly for pickling and otherwise pretreating iron parts which, subsequently to this treatment, are to be provided with a metal coating, e. g. a coating of zinc. The primary aim achieved by the rotation of the drum is to wet with certainty all the interior and exterior surfaces of the metal parts charged thereinto. It is known practice to move about, in a treatment bath, barrels charged with metal parts, in order to encompass as intense and active as possible a change of the liquid treatment medium within the barrels themselves. Such arrangements are known under the name of rocker-type pickling baths.

The present invention differs from known arrangements for the treatment of metal parts in barrels in that the barrel is suspended on ropes the ends of which are attached to a swinging double lever.

In the drawings,

Fig. 1 a lateral elevation of an embodiment of the invention;

Fig. 2 a section alon the line II-II in Fig. 1.

Figs. 1 and 2 illustrate a tank or vat I filled with a liquid 2. A cylindrical drum or barrel 3 accommodates the metal parts 4 to be treated. The barrel 3 is provided at its ends with two grooves 5 serving as guides for two steel ropes 6 whose ends 1 and 8 are secured to a two-armed lever I0 with arms of unequal length pivotingly arranged on a shaft 9. The shaft 9 of the twoarmed lever 10 is supported in two bearing brackets II. A further arm I2 is secured to the two-armed lever 10, which arm i2 is acted upon by the connecting rod I 3. The motor [4 produces the pivoting motion of the two-armed lever [B through the agency of a crank l5. I6 is the crank-bearing of the connecting rod I3.

The manner in which the described arrangement functions will now be explained in reference to the drawing: the connecting rod I3 is given a reciprocatory motion by the motor H with the result that it pivots the two-armed lever l0 through an angle of approximately 90. In Fig. 1 the end position of the two-armed lever is partly indicated by the discontinuous outline of the end 8. The dimension arrow [1 shows the stroke or travel described by the end 8 of the steel rope 6 during the reciprocatory motion. The end 1 of the steel rope 6 performs a shorter 2 stroke or travel Hi. The axis of the barrel 3 is raised by half the difference between the strokes I! and I8, and lowered again. In Fig. 1 the movement of the barrel is represented by the dimension arrow l9.

To charge and discharge the barrel 3, the latter is lifted out of the bath 2. The embodiment shown in Figs. 1 and 2 of an arrangement for treating metal parts may be built and used in multiple type without altering the principle. In this event it is possible, for instance, to arrange a plurality of barrels on a conveyor system of the roundabout type with a view to stageby-stage treatment of the contents of the barrels.

The inventive idea includes a provision of double levers having arms of unequal lengths to provide a rotary movement simultaneously with a reciprocatory movement of the drum. The rotary movement imparted to the barrel provides for a thorough netting of all the metal parts and causes complete removal of the occluded air bubbles and of the gases which arise during pickling. The rotary motion also renders possible complete discharge of the barrel when it is lifted clear of the bath. The displacement of the axis of the barrel in the course of the reciprocatory movement produces a more vigorous change of liquid treatment medium within the barrel.

The embodiments illustrated do not exhaust the possibilities of the inventive idea; other constructions are conceivable for producing the simultaneous rotary and reciprocatory motion of the barrel.

What I claim is:

A device for treating metal parts, said device comprising in combination with a tank for a treating liquid and a drum for said metal parts, ropes suspending said drum within said tank, a lever pivoted intermediate its ends and having two arms of unequal length, said ropes being attached to said ends, and means connected with said lever for swinging the same about its pivot.

ERWIN BUHRER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 509,880 Dobson Dec. 5, 1893 1,520,676 Koppin Dec. 23, 1924 1,533,870 Lee Apr. 14, 1925 2,392,911 Gaudet Jan. 15, 1946 2,520,527 Campion Aug. 29, 1950 

